Question

Metal x becomes green when left in airtel black when heated in air name the metal and compounds formed in both the cases

Answer 1

Correct question:-

Metal x becomes green when left in air black when heated in air name the metal and compounds formed in both the cases.

Ans :-

Metal :- Copper

The compound formed when kept in air is :-

$CuCO_3.Cu(OH)2.$

The compound formed when heated in air is :-

$CuO$

Explanation:-

Copper reacts with oxygen and moisture present in air to form a greenish layer which is also known as copper basic carbonates.

The reaction can be stated as follows:-

$Cu + O_2 + H_2O + CO_2 \rightarrow Cu(OH)_2.CuCO_3$

When copper is heated in present of air it get oxidised and form cupric oxide which is black in colour .

The reaction can be written as :-

$2Cu + O_2 \rightarrow 2CuO$